Rune Allnor wrote:
> On 4 Jul, 16:03, Jerry Avins <j...@[EMAIL PROTECTED]
> wrote:
>> Rune Allnor wrote:
>>> On 4 Jul, 13:30, "novatron1_2" <novatron...@[EMAIL PROTECTED]
> wrote:
>>>> I'm trying to separate a data signal of ~800Hz from a carrier wave
which is
>>>> ~2000Hz. As both frequencies vary slightly over time I was hoping to
use
>>>> envelope detection to strip off the carrier, my sample rate is 22560.
>>> That's a novel way of doing things? What's wrong with an
>>> off-the-shelf lowpass filter?
>> Maybe he needs to demodulate an AM signal and doesn't appreciate the
>> difference between demodulation and separation.
>
> Well, 'separation' is hardly a well-defined technical term.
> Maybe the OP meant demodulation; I certainly interpreted
> this as a filter problem.
He made he first part seem like one, but he mentioned "carrier" and
"envelope", and described an AM demodulation technique.
I at first mistook his carrier frequency to be 8000 KHz. At the actual
frequencies and with that sample rate, peak detection won't work for AM,
so he does need the quadrature signal. Of course, unless the modulation
percentage is very high or the signal is already sampled, a diode and
capacitor would do the task.
Jerry
--
Engineering is the art of making what you want from things you can get.
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